Magnetic head assembly having a rotational arm for electrically connecting the magnetic head to an external circuit and methods of manufacturing the same

ABSTRACT

A connecting portion of the external side FPC board connected to a control circuit provided outside of a magnetic head assembly and connecting terminals of arm side FPC boards respectively connected to magnetic heads are overlapped with an anisotropic conductive tape having anisotropic conductivity in the direction of thickness in between. The anisotropic conductive tape is applied pressure between the connecting portion and the connecting terminals with heating to a temperature of, for example, 150° C. and is set. As a result, the connecting portion and the connecting terminals are connected. The anisotropic conductive tape has anisotropic conductivity only in the direction of thickness so that conduction of wirings adjacent each other is prevented although a plurality of wirings is formed on the connecting portion and the connecting terminals.

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This is a divisional application of co-pending U.S. applicationSer. No. 09/694,010 filed Oct. 23, 2000. The entire disclosure of theprior application is hereby incorporated by reference in its entirety.

BACKGROUND OF THE INVENTION

[0002] 1. Field of Invention

[0003] The present invention relates to a magnetic head assembly usingfor a magnetic disk apparatus or the like, to a method of manufacturingthe same and to a method of wiring the same using for signaltransmission between a magnetic head and external.

[0004] 2. Description of Related Art

[0005] Generally, in magnetic disk apparatus, a magnetic head assemblyreads out/writes information on a magnetic disk of recording medium. Amagnetic head assembly comprises a rotational arm rotating along arecording surface of a magnetic disk. On the tip of the rotational arm,a magnetic head for reading/writing information of magnetic disk ismounted.

[0006] In order to enable signal transmission between a control circuitprovided on the body portion of a magnetic disk apparatus and themagnetic head mounted on the tip of the rotational arm, the controlcircuit and the magnetic head need to be electrically connected by useof a flexible printed circuit board or the like. A method of connectinga control circuit and a magnetic head of the related art is as follows.First, the magnetic head and a relay flexible printed circuit board(hereinafter referred to as a relay FPC board) are connected through apattern of a conductive material formed on the rotational arm. Theflexible printed circuit board connected to the control circuit(hereinafter referred to as an external side FPC board) is connected tothe relay FPC board. The external side FPC board and the relay FPC boardas well as the relay FPC board and the pattern are respectivelyconnected by ultrasonic welding or solder fusion.

[0007] In such a method of connecting by ultrasonic welding or solderfusion, however, the connecting operation is complicated. This resultsin defects in connection. Specifically, in a method by using ultrasonicwelding, gold plate covering the surfaces of the relay FPC board and theexternal side FPC board is peeled off.

[0008] Unexamined Patent Application Publication No. Hei 9-180380proposes the following method. A connecting portion of the external sideFPC board and a connecting portion of the relay FPC board are previouslyattached to the facing surfaces of two components constituting therotational arm and the two connecting portions are connected to besandwiched between the components in fabricating the rotational arm. Thepublication refers to the interposition of an adhesive havinganisotropic conductivity between the connecting portions of the externalside FPC board and the relay FPC board.

[0009] In the method disclosed in the above-mentioned Unexamined PatentApplication Publication, the external side FPC board and the relay FPCboard are connected in the rotational arm. It makes it impossible towork with the connecting condition observed. This results in poorworkability. No detailed description is made for the method ofconnecting using an adhesive having anisotropic conductivity in thepublication.

SUMMARY OF THE INVENTION

[0010] The present invention is designed to overcome the foregoingproblems. It is an object of the invention to provide a magnetic headassembly with low defect in connection and good workability, and methodsof manufacturing and wiring the same.

[0011] A method of wiring a magnetic head assembly of the inventioncomprises the steps of providing an arm side-wiring member, one end iselectrically connected to the magnetic head and the other end has afirst connecting portion, on the rotational arm; preparing an externalside-wiring member, one end is connectable to the external circuit andthe other end has a second connecting portion; and electricallyconnecting the arm side-wiring member and the external side-wiringmember by overlapping the first connecting portion and the secondconnecting portion with a predetermined conductive adhesive member inbetween on the rotational arm.

[0012] In a method of wiring a magnetic head assembly of the invention,the arm side-wiring member and the external side-wiring member are fixedsandwiching a conductive adhesive member having anisotropic conductivityand connected. The conductive adhesive member has conductivity only inthe direction of overlapping. This prevents conduction of each adjacentterminal even if there is a plurality of terminals in the firstconnecting portion of the arm side-wiring member or the secondconnecting portion of the external side-wiring member. The connection ofthe arm side-wiring member and the external side-wiring member on apredetermined exterior surface of the rotational arm facilitates theconnection process.

[0013] In a method of wiring a magnetic head assembly of the invention,desirably, a plurality of the arm side-wiring members are providedcorresponding to the plurality of magnetic heads, respectively; and thefirst connecting portions of the plurality of arm side-wiring membersand the second connecting portion of the external side-wiring member areconnected in a single step in the connecting step. The rotational armmay comprise an arm tip mounting the magnetic head and a rotatable armbody supporting the arm tip and the first connecting portions of the armside-wiring members and the second connecting portion of the externalside-wiring member may be overlapped in the connecting step.

[0014] Additionally, it is desirable that the connecting step comprisesa step of curing of the conductive adhesive member. The conductiveadhesive member may be thermosetting and heated to a temperature higherthan that allowing the conductive adhesive member to be completely setin the step of curing. In this case, desirably, the conductive adhesivemember is once heated to a temperature lower than that allowing theconductive adhesive member to be completely set before the step ofcuring. Desirable conductive adhesive members are an adhesive tape madeof anisotropic conductive resin or a paste adhesive made of anisotropicconductive resin. Further, a flexible printed circuit board is desirablefor the external side-wiring member.

[0015] Desirably, the arm side-wiring member is fabricated of the wiringpattern made of a conductive material formed on the rotational arm andthe relay board for electrically connecting the wiring pattern and theexternal side-wiring member. In this case, the flexible printed circuitboard can be used for the relay board. Further, it is desirable toinclude the step of overlapping and electrically connecting the relayboard and the wiring pattern sandwiching a predetermined conductiveadhesive member having anisotropic conductivity in the direction ofoverlapping.

[0016] A method of manufacturing a magnetic head assembly of theinvention comprises a step of wiring for electrically connecting themagnetic head and an external circuit, wherein the step is performedwith the above-mentioned method of wiring a magnetic head assembly.

[0017] In a method of manufacturing a magnetic head assembly of theinvention, it is desirable to provide the inspection terminal in the armside-wiring member. In this case, desirably, before the above-mentionedstep of: wiring, the steps of performing a predetermined inspection ofthe magnetic head with use of the inspection terminal of the armside-wiring member; and removing the inspection terminal from the armside-wiring member after the inspection are further comprised.

[0018] A magnetic head assembly of the invention comprises: a magnetichead; a rotational arm mounting the magnetic head; an arm side-wiringmember, one end is electrically connected to the magnetic head and theother end has a first connecting portion, provided on the rotationalarm; and an external side-wiring member, one end is able to electricallyconnected to an external circuit provided separately form the rotationalarm and the other end has a second connecting portion, wherein the firstconnecting portion of the arm side-wiring member and the secondconnecting portion of the external side-wiring member are overlappedwith a predetermined conductive adhesive member having anisotropicconductivity in between and electrically connected to each other on therotational arm.

[0019] In a magnetic head assembly of the invention, desirably, the armside-wiring member comprises a wiring pattern made of a conductivematerial formed on the rotational arm and a relay board electricallyconnecting the wiring pattern and the external side-wiring member, andthe relay board and the wiring pattern are overlapped with apredetermined conductive adhesive member having anisotropic conductivityin between and electrically connected to each other.

[0020] Other and further objects, features and advantages of theinvention will appear more fully from the following description.

BRIEF DESCRIPTION OF THE DRAWINGS

[0021]FIG. 1 is a perspective view showing a structure of a magnetichead assembly that is applied a method of wiring according to anembodiment of the invention;

[0022]FIG. 2 is a perspective view showing a structure of the arm tip ofthe magnetic head assembly shown in FIG. 1;

[0023]FIG. 3 is a plan view showing a structure of a relay FPC boardaccording to the embodiment;

[0024]FIG. 4 is a sectional view showing a state that the relay FPCboard shown in FIG. 3 is attached to the arm tip;

[0025]FIG. 5 is a view showing a vicinity of a connecting portion of anexternal side FPC board;

[0026]FIG. 6 is a view showing a state that the connecting portions ofthe external side FPC board and the relay FPC board are connected;

[0027]FIG. 7 is a sectional view showing the sectional structure of theconnecting portion shown in FIG. 6;

[0028]FIG. 8 is a flow chart showing a method of manufacturing themagnetic head assembly according to the embodiment of the invention; and

[0029]FIG. 9 is a perspective view showing a step of the method ofmanufacturing the magnetic head assembly according to the embodiment ofthe invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0030] Embodiments of the invention will be described in detail belowwith reference to the accompanying drawings.

[0031] Configuration of Magnetic Head Assembly

[0032] First, a configuration of a magnetic head assembly that isapplied a method of wiring a magnetic head assembly according to anembodiment of the present invention will be described.

[0033]FIG. 1 is a perspective view showing a configuration of a magnetichead assembly 100 that is applied a method of wiring a magnetic headassembly according to an embodiment. In a magnetic disk apparatusprovided the magnetic head assembly 100, two magnetic disks of arecording medium (not shown) are rotatably supported with an axiscentered, for instance. The magnetic head assembly 100 comprises arotational arm 1 rotating with the axis Y, which is parallel to therotation axis of the magnetic disk, centered. The rotational arm 1comprises an arm body 10 as a solid block rotatably supported by aradial bearing 12 with the axis Y centered.

[0034] The rotational arm 1 comprises four arm tips 1 a, 1 b, 1 c and 1d extended from the arm body 10 parallel to the surface and backside ofthe magnetic disk. The arm tips 1 a to 1 d are almost evenly spacedalong the axis Y of the rotational arm 1 (in the vertical direction inFIG. 1). A driving coil 14 for driving the rotational arm 1 is attachedto the arm body 10 of the opposite side of the arm tips 1 a to 1 d. Thedriving coil 14 constitutes a voice coil motor together with an unshownmagnetic circuit provided as other part of the magnetic disk apparatus.More specifically, application of current to the driving coil 14produces driving force for rotating the rotational arm 1 by an actionwith the magnetic field by the magnetic circuit.

[0035] On the tip of the arm tips 1 a to 1 d, magnetic heads 2 a, 2 b, 2c and 2 d are respectively mounted to face the surface and backside ofthe magnetic disk. Each magnetic head 2 a to 2 d includes either or bothof a reproducing head comprising, for example, magnetoresistive element(so called MR element), or/and a recording head comprising, for example,an inductive-type magnetic transducer.

[0036] Conductive patterns 8 a, 8 b, 8 c and 8 d are formed on the armtips 1 a to 1 d by, for example, printing for signal transmissionbetween each magnetic head 2 a to 2 d of the magnetic head assembly 100and a control circuit 6 of the magnetic disk apparatus. One ends of theconductive patterns 8 a to 8 d are connected to the magnetic heads 2 ato 2 d and the other ends extend to the arm body 10, respectively. Fourrelay FPC boards 3 a, 3 b, 3 c and 3 d are provided on a side of the armbody 10 and one ends of the relay FPC boards 3 a to 3 d are connected tothe conductive patterns 8 a to 8 d in the base of the arm tips 1 a to 1d. The other ends of the relay FPC boards 3 a to 3 d are connected to anexternal side FPC board 4. The external side FPC board 4 comprises aconnecting portion 40 to be connected to the relay FPC boards 3 a to 3 dat one end and a connecter 41 to be able to connect to the controlcircuit 6 at the other end.

[0037]FIG. 2 is a perspective view showing a structure of the arm tip 1a. The arm tip 1 a is fabricated of a long plate 103 of metal in athickness of, for example, about 0.05 mm and is fixed a mounting plate101 of substantially square plate member to one end in the longitudinaldirection. The mounting plate 101 is fixed to the bottom side of the armtip 1 a and to the arm body 10 through a mounting hole 102. To thebottom side of the long plate 103 of the opposite side of the mountingplate 101, almost cuboid shaped slider 20 a is fixed. At an end face ofthe slider 20 a, the magnetic head 2 a is formed. A head terminal 25 aconsisted of four terminals 201, 202, 203 and 204 for signal input andoutput to the magnetic head 2 a is formed on the top or end face of theslider 20 a of FIG. 2.

[0038] On the top surface of the long plate 103 of the arm tip 1 a, theconductive pattern 8 a consisted of four wirings 81, 82, 83 and 84 madeof conductive materials is formed. The wirings 81 to 84 of theconductive pattern 8 a are connected to the terminals 201 to 204 of thehead terminal 25 a in the end of the long plate 103, respectively. Theconductive pattern 8 a extends toward the mounting plate 101 on the longplate 103 and bends approximately at a right angle just before reachingto the mounting plate 101. The bended conductive pattern 8 a thenreaches to the side end face of the mounting plate 101 and connects to aconnecting pad 9 a formed thereon.

[0039] The arm tips 1 b to 1 d are fabricated substantially similar tothe arm tip 1 a. However, as shown in FIG. 1, the arm tip 1 b of thesecond step from the top comprises the magnetic head 2 b on its top faceand the conductive pattern 8 b on its bottom face. Similarly, the armtip 1 d of the fourth step from the top comprises the magnetic head 2 don its top face and the conductive pattern 8 d on its bottom face. Onthe other hand, the arm tip 1 c of the third step from the top comprisesthe magnetic head 2 c on its bottom face and the conductive pattern 8 con its top face.

[0040]FIG. 3 shows the whole shape of the relay FPC board 3 a. The relayFPC board 3 a is formed of a flexible and long shaped base 35 a made ofpolyimide and four wirings 36 a formed thereon, for instance. A relayterminal 34 a consisted of four terminals 341, 342, 343 and 344, whichcorrespond to four wirings 36 a, is formed at an end of the relay FPCboard 3 a in the longitudinal direction. A connecting terminal 30 a forconnecting to the external side FPC board 4 is formed in approximatelythe center of the relay FPC board 3 a in the longitudinal direction. Theconnecting terminal 30 a is consisted of four terminals correspond tofour wirings 36 a. An inspection terminal 33 a is formed at the otherside of the relay terminal 34 a sandwiching the connecting terminal 30 aof the relay FPC board 3 a.

[0041] The inspection terminal 33 a is used for inspecting the magnetichead 3 a or the like before connecting the relay FPC board 3 a to theexternal side FPC board 4. After later-described inspection of themagnetic head 3 a, the inspection terminal 33 a is cut in the partindicated by a chain line C in FIG. 3 and separated from the relay FPCboard 3 a. As a result, the connecting terminal 30 a is positioned at anend of the relay FPC board 3 a.

[0042] The structures of the other relay FPC boards 3 b, 3 c and 3 d aresimilar to that of the relay FPC board 3 a so the illustration and thedescription thereof are omitted.

[0043]FIG. 4 is a sectional view taken along line IV-IV of FIG. 3 fordescribing the connecting condition of the relay FPC board 3 a and theconnecting pad 9 a of the arm tip 1 a. The connecting pad 9 a formed ona side of the mounting plate 101 of the arm tip 1 a is consisted of fourterminals 91, 92, 93 and 94, each connected to the wirings 81, 82, 83and 84 (see FIG. 2) of the conductive pattern 8. The terminals 91, 92,93 and 94 of the connecting pad 9 a are spaced same apart as theterminals 341, 342, 343 and 344 of the relay terminal 34 a. For theconnection of the relay terminal 34 a of the relay FPC board 3 a and theconnecting pad 9 a, an anisotropic conductive tape 7 made of anisotropicconductive resin having conductivity only to the direction of thicknessis used. In other words, the relay terminal 34 a and the connecting pad9 a are adhered to face each terminal 341 to 344 and 91 to 94 with theanisotropic conductive tape 7 in between.

[0044] A tape having a cure temperature of about 150° C. and exhibitinga certain adhesion with heating to about 100° C. is desirable as theanisotropic conductive tape 7. Specifically, CP series (product name)manufactured by Sony Chemicals Corporation or the like is used. A pasteadhesive of anisotropic conductive resin may be used instead of theanisotropic conductive tape 7. The anisotropic conductive tape 7 hasconductivity only to the direction of thickness. This preventsconduction of each terminal of the relay terminal 34 a or that of theconnecting pad 9 a.

[0045]FIG. 5 is an enlarged plan view showing part of the external sideFPC board 4. A number of wirings 44 formed on a flexible base 45 madeof, for example, polyimide for signal transmission with the magneticheads 2 a to 2 d forms the external side FPC board 4. Each wiring 44extends to an end edge 4E of the external side FPC board 4 and terminals47 a, 47 b, 47 c and 47 d of the end of the wirings 44 are aligned alongthe end edge 4E. Each terminal 47 a to 47 d is used for signaltransmission with the magnetic heads 2 a to 2 d and constitutes theconnecting portion 40 of the external side FPC board 4. The componentindicated by reference numeral 49 in FIG. 5 is IC chip. The IC chip 49performs generation of recording current, amplification of reproducingsignal, and switching recording and reproducing to the magnetic heads 2a to 2 d.

[0046] The connecting portion 40 of the external side FPC board 4 andthe connecting terminals 30 a, 30 b, 30 c and 30 d formed in the relayFPC boards 3 a to 3 d are connected with an anisotropic conductive tape5 exhibiting conductivity only in the direction of thickness like theabove-described anisotropic conductive tape 7. The anisotropicconductive tape 5 has enough width and length to completely cover theconnecting portion 40. A tape having a cure temperature of about 150° C.and exhibiting a certain adhesion under heating to about 100° C. isdesirable as the anisotropic conductive tape 5. CP series (product name)manufactured by Sony Chemicals Corporation or the like can be used, forinstance. A paste adhesive of anisotropic conductive resin may be usedinstead of the anisotropic conductive tape 5.

[0047]FIG. 6 is a plan and sectional view showing the state that theconnecting portion 40 and the connecting terminals 30 a to 30 d areoverlapped. FIG. 7 is a sectional view of FIG. 6 taken along lineVII-VII. As shown in FIG. 7, the connecting terminals 30 a to 30 d arerespectively overlapped on the connecting portion 40 sandwiching theanisotropic conductive tape 5. The anisotropic conductive tape 5 hasconductivity only to the direction of thickness. This preventsconduction of each connecting terminal 30 a to 30 d or that of theconnecting portion 40.

[0048] The external side FPC board 4 corresponds to a specific exampleof the “the external side-wiring member” of the invention. The relay FPCboards 3 a to 3 d and the conductive patterns 8 a to 8 d correspond to aspecific example of the “arm side-wiring member” of the invention.Further, the anisotropic conductive tape 5 corresponds to a specificexample of the “conductive adhesive member” of the invention. Moreover,the magnetic heads 2 a to 2 d correspond to a specific example of the“magnetic head” of the invention and the rotational arm 1 corresponds toa specific example of the “rotational arm” of the invention.

[0049] A Method of Manufacturing a Magnetic Head Assembly

[0050] Description will now be made for a method of manufacturing amagnetic head assembly according to the embodiment. FIG. 8 is a flowchart showing a method of manufacturing the same and each step will bedescribed along the flow chart.

[0051] First, as shown in FIG. 2, a relay FPC board 2 a is attached tothe arm tip 1 a (S10). In other words, the connecting pad 9 a providedon the mounting plate 101 of the arm tip 1 a and the relay terminal 34 aof the relay FPC board 3 a are fixed and connected sandwiching theanisotropic conductive tape 7. Specifically, the anisotropic conductivetape 7 is adhered to the connecting pad 9 a with heating to below itscure temperature, for example, at 100° C. and then the relay terminal 34a is adhere to the anisotropic conductive tape 7. At this time, theposition of the relay terminal 34 a is adjusted to face each terminal341, 342, 343 and 344 of the relay terminal 34 a (see FIG. 5) and eachterminal 91, 92, 93 and 94 of the connecting pad 9 a by using, forexample, a microscope. It is possible to readhere the relay terminal 34a for adjusting its position because the anisotropic conductive tape 7incompletely sets.

[0052] Subsequently, the anisotropic conductive tape 7 is pressed withheating at a temperature of, for example, 150° C., which is slightlyhigher than its cure temperature, thereby set the anisotropic conductivetape 7. After that, the relay terminal 34 a and the connecting pad 9 aare fixed and connected. The anisotropic conductive tape 7 may be firstadhered to the relay terminal 34 a and then adhere the connecting pad 9a thereto. Alternatively, in overlapping the relay terminal 34 a and theconnecting pad 9 a, the anisotropic conductive tape 7 may be sandwichedtherebetween.

[0053] Similar to the above-described method, each terminal of relay FPCboards 3 b, 3 c and 3 d is connected to each connecting pad of the armtips 1 b, 1 c and 1 d.

[0054] The magnetic heads 2 a to 2 d are respectively inspected with theinspection terminals 33 a to 33 d of the relay FPC boards 3 a to 3 d(S12). A dynamic characteristic with use of a magnetic disk, MRresistance and so on are inspected. Specific description of the methodof inspection is omitted. After completing the inspection of themagnetic heads 2 a to 2 d, the inspection terminals 33 a to 33 d are cutoff and removed (S14).

[0055] The arm tips 1 a to 1 d attached the relay FPC boards 3 a to 3 dare sequentially attached to the arm body 10 as shown in FIG. 9 (S16).The arm tips 1 a to 1 d attached to the arm body 10 by fitting fixtures(not shown) to each mounting hole 102 of the arm tips 1 a to 1 d. Withthe arm tips 1 a to 1 d are attached to the arm body 10, each connectingportion 30 a to 30 d of the relay FPC boards 3 a to 3 d reaches to aside 11 of the arm body 10.

[0056] As shown in FIG. 1, the relay FPC boards 3 a to 3 d are connectedto the connecting portion 40 of the external side FPC board 4 (S18).Specifically, first, the external side FPC board 4 is adhered to theside 11 of the arm body 10 with the connecting portion 40 turnedoutside. The anisotropic conductive tape 5 is adhered to the connectingportion 40 with heating to below its cure temperature, for example, at100° C. and then the connecting terminals 30 a to 30 d of the relay FPCboards 3 a to 3 d are adhere to the anisotropic conductive tape 5. Atthis time, the position of the connecting terminals 30 a to 30 d isadjusted to face each terminal 47 a to 47 d of the connecting portion 40and each terminal 30 a to 30 d. It is possible to readhere theconnecting terminals 30 a to 30 d because the anisotropic conductivetape 5 incompletely sets. Subsequently, the anisotropic conductive tape5 is pressed with heating at a temperature of, for example, 150° C.,which is slightly higher than its cure temperature, thereby set theanisotropic conductive tape 5. After that, the connecting portion 40 andthe connecting terminals 30 a to 30 d are fixed and connected.

[0057] The anisotropic conductive tape 5 may be first adhered to theconnecting terminals 30 a to 30 d and then the connecting portion 40 isadhered thereto. Alternatively, in overlapping the connecting portion 40and the connecting terminals 30 a to 30 d, the anisotropic conductivetape 5 may be sandwiched therebetween.

[0058] Thus, the magnetic head assembly 100 shown in FIG. 1 ismanufactured.

[0059] Effects of the Embodiment

[0060] As described above, according to the method of wiring a magnetichead assembly of this embodiment, the connecting portion 40 of theexternal side FPC board 4 and the connecting terminals 30 a to 30 d ofthe relay FPC boards 3 a to 3 d are overlapped and fixed by theanisotropic conductive tape 5. This enables to connect a plurality ofwirings of both connecting portions in a single step. As a result,defects in connection are reduced and connecting process is simplifiedas compared to the individual connection by each wiring. This alsoprevents peeling of gold plate formed on, for example, the external sideFPC board 4 without using ultrasonic welding. The connecting portion 40of the external side FPC board 4 is connected to the connectingterminals 30 a to 30 d of the relay FPC board 3 a to 3 d on the side 11of the arm body 10. This enables to operate with observing theconnecting condition and therefore the workability is improved.

[0061] The relay terminals 34 a to 34 d of the relay FPC boards 3 a to 3d are connected to the connecting pad of the arm tips 1 a to 1 d withthe anisotropic conductive tape 7. As a result, connecting process issimplified and defects in connection are reduced. Further, as shown inFIG. 2, the component, which is the relay FPC board 3 a is attached tothe arm tip 1 a, can be treated as a unit and therefore the workabilityin manufacturing is improved.

[0062] In overlapping the connecting terminal 40 of the external sideFPC board 4 and the connecting terminals 30 a to 30 d of the relay FPCboards 3 a to 3 d, the anisotropic conductive tape 5 is heated to, forexample, 100° C. to temporarily fix the connecting terminal 40 and theconnecting terminals 30 a to 30 d. This prevents a deviation of therelative position of both connecting portions before complete set of theanisotropic conductive tape 5.

[0063] Although the present invention has been described by someembodiments and examples, the invention is not limited to the foregoingembodiments and examples but can be variously modified. For example, inFIG. 1, as an alternative to using the relay FPC boards 3 a, 3 b, 3 cand 3 d, the conductive patterns 8 a, 8 b, 8 c and 8 d may be formed toextend to the side 11 of the arm body 10 and be connected the connectingportion 40 of the external side FPC board 4 to its one end. In thiscase, the anisotropic conductive tape 5 can be used.

[0064] The Number of Arm Tips May be Unlimited

[0065] As described above, according to a magnetic head assembly andmethods of wiring and manufacturing the same of the invention, theconnecting portions of the external side-wiring member and of the armside-wiring member are overlapped and connected with a conductiveadhesive member having anisotropic conductivity in between. As a result,it is easy to connect as compared to ultrasonic welding or solderfusion, for instance. The connecting portions are overlapped on apredetermined exterior surface of the rotational arm. This enables tooperate with observing the connecting condition and therefore reducedefects in connection.

[0066] According to a method of wiring a magnetic head assembly of theinvention, the external side-wiring member and a plurality of armside-wiring members are connected in a single step. This enables tofurther improve the workability.

[0067] According to a method of wiring a magnetic head assembly of theinvention, the conductive pattern forms the arm side-wiring member andthe relay board are connected with a conductive adhesive member havinganisotropic conductivity. This enables to further simplify theconnecting process.

[0068] According to a magnetic head assembly and a method ofmanufacturing the same of the invention, a predetermined inspection withthe inspection terminal of the arm side-wiring member for a magnetichead is performed before connecting the external side-wiring member andthe arm side-wiring member. After that, the inspection terminal isremoved form the arm side-wiring member. As a result, the quality of amagnetic head is easily inspected in fabricating a magnetic headassembly. Separation and removal of the inspection terminal from the armside-wiring member saves space in a magnetic disk apparatus, forexample.

[0069] Obviously many modifications and variations of the presentinvention are possible in the light of the above teachings. It istherefore to be understood that within the scope of the appended claimsthe invention may be practiced otherwise than as specifically described.

What is claimed is:
 1. A magnetic head assembly comprising: a magnetichead; a rotational arm mounting the magnetic head; an arm side-wiringmember, one end is electrically connected to the magnetic head and theother end has a first connecting portion, provided on the rotationalarm; and an external side-wiring member, one end is able to electricallyconnected to an external circuit provided separately form the rotationalarm and the other end has a second connecting portion, wherein the firstconnecting portion of the arm side-wiring member and the secondconnecting portion of the external side-wiring member are overlappedwith a predetermined conductive adhesive member having anisotropicconductivity in between and electrically connected to each other on therotational arm.
 2. A magnetic head assembly according to claim 1,wherein the arm side-wiring member comprises a wiring pattern made of aconductive material formed on the rotational arm and a relay boardelectrically connecting the wiring pattern and the external side-wiringmember, wherein the relay board and the wiring pattern are overlappedwith a predetermined conductive adhesive member having anisotropicconductivity in between and electrically connected to each other.